modelform failed is_valid w/o setting form.errors

Question

我正在使用modelform來顯示模型中只有一部分字段。當表單被提交時，它失敗了form.is_valid（），但form.errors是空的。我不想在這裏展示我所有的代碼，但下面是一個示例：

式樣和

class Videofiles(models.Model): 
    active = models.CharField(max_length=9) 
    filenamebase = models.CharField(max_length=180, primary_key=True, db_column='FilenameBase') 
    program = models.CharField(max_length=60, db_column='Program') 
    displayname = models.CharField(max_length=150, db_column='DisplayName') 
    description = models.TextField(db_column='Description', blank=True) 
    tagskeywords = models.TextField(db_column='TagsKeywords', blank=True) 

    class Meta: 
     db_table = u'legacyTable' 

class VideoFilesForm(ModelForm): 
    filenamebase = forms.CharField(max_length=30) 
    displayname = forms.CharField(max_length=30) 
    description = forms.CharField(max_length=30, required=False) 
    tagskeywords = forms.CharField(max_length=60, required=False) 

    class Meta: 
     model=Videofiles 
     fields=['filenamebase','displayname','description','tagskeywords'] 

查看

def editClip(request, clipId): 
    clip = Videofiles.objects.get(filenamebase=clipId) 
    form = VideoFilesForm(instance=clip) 
    if request.method == 'POST': 
     if 'save' in request.POST: 
      if form.is_valid(): 
       form.save() 
      else: 
       print form.errors 
    return render_to_response('legacyDB/edit_clip.html',locals()) 

Answer 1

您的形式是未綁定的，因爲你沒有傳遞任何數據。在未綁定的表單上調用is_valid將始終返回False，並出現空錯誤（請參閱form api docs）。

你的觀點應該是這樣的：

def editClip(request, clipId): 
    clip = Videofiles.objects.get(filenamebase=clipId) 
    if request.method == 'POST': 
     # create bound form with input from request.POST 
     form = VideoFilesForm(request.POST, instance=clip) 
     if 'save' in request.POST: 
      if form.is_valid(): 
      form.save() 
     else: 
      print form.errors 
    else: 
     # create unbound form to display in template 
     form = VideoFilesForm(instance=clip) 
      return render_to_response('legacyDB/edit_clip.html',locals())